Circuit-breaker.



H. W. CHENEY.

CIRCUIT BREAKER.

APPLICATION FILED SEPT.25,1905.

Patented June 15, 1909.

4 SHEETS-SHEET 1.

Inventor:

frlert W Cheney- M Attorney v H. W. CHENEY.

CIRCUIT BREAKER.

APPLICATION FILED SEPT.25, 1905.

Patented June 15, 1909.

4 SHEETS-SHEET 2.

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CIRCUIT BREAKER.

APPLICATION FILED SEPT.25, 1905.

Patented June 15, 1909.

4 SHEETS-SHEET 3.

Inventor.-

flr'b'en W ('heney Attorney- Wtnesses 1 H. W. CHENEY.

CIRCUIT BREAKER.

APPLICATION FILED SEPT. 25, 1905.

Patented June 15, 1909.

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HERBERT w. cHENEY; OF Nonwoon, onio, assronon TO ran BULLOCK ELEc'rnic'MANU= FAcTURmecoMPANY, A CORPORATION OF 01110.

cinema-enema.

application filed September 25, 1905. serial No. eac -"1r.

To allwiiom it may concern:

.Be it known that I, HERBERT W. CHENEY, v

citizen of the United States, residing at Norwood, in the county ofHamilton and State of Ohio, have invented certain new and usefulImprovements in Circuit-Breakers, of which the following is a full,clear, and exact specification. p

This invention relates to circuit-breakers especially of the railwaytype.

One of the ob'ects of my invention :i-sto simplify and to essen the costof the con struction of this type of circuit-breakers.

A further object is to rovide a circuithreaker which consists '0 fewparts, and

which is durable, efficient and reliable in o p-.

oration. I A still further obj set is to provide a circuitoreaker allthe parts of which can be easily T inspected and removed in case ofinjury or for any other purpose. 7

Further objects will appear from the description.

My invention consists in certain novel details of construction and thecombinations of elements described in the specification and set forth inthe appended claims.

Reference is had to the accompanying drawings in which Figure 1 is aplan of a circuit-breaker in its open position or with the contacts outof-enev gagement, the inclosing cover being removed; Fig. 2 is a planview if the same with parts in section and arts bro en away for the sakeof clearness; 't e circuit-breaker is here shown as closed; Fig. 3-is asection along the irregular line 33 of Fig} 2 looking in the-.d-irection of the arrows; Fig. 4 is a section along the irregular line44 of Fig. 2 looking in the direction of the arrows; Pig. 5 is a view ofa portion of the circuit-hreaker with the arcing chute removed and thepole shoe turned on. its pivot out of its operative position; Fig. 6 j

is a sectional detail of a portion 'of the core of the magnet and poleshoe showing the swivel support of the latter; and Pi s. 7 and 8 areplan and side views respective y of one of the stationary contacts.

Referring tothe figures oi the LlI'flWHI 'S l have shown at 10 a castmetal base provided with perforated cars 11 by means of which thecircuit-breaker is adapted to be supported, preferably, at the top orceiling of the railway car or atform hood. At opposite sides of, and adacent the corners of t e base Specificaiim of' 'Letters Eatent.

@atsnted Elmo 165, 1909.

are two similar arms 12 extending outward at right angles to the base.Seated on the base and between the two arms an insulating block 13,preferably of slate or soapstone. The block is held to the base byBabbitt metal or other easily fusible metal or alloy instead of screwsor bolts. The arms 12 and base 10 are provided with a continuous channelor roove 14, the groove the arms 12 being shown in Figs. 1 and 2 and inthe base at the upper left hand side of Fig. 4.. The block 13 isprovided at intervals with opens or recesses 15 which communicate withthis channel. As the block is placed in position on the base, metal 16is run into :the channel and o enings 15 in the block, the

parts of the circuit hreaker, without necessi tating'careiul machiningof the base. A further advantage is that the insulating block and baseare :held together by the holding meanswhich is distributed evenly alongtheends and side of the block." /Vhereas if bolts and screws wereemployed the block would he held to the base at a few oints only. Theinsulating clock supports directly or indirectly allthe contact membersof .the

circuit-breaker. v The circuit-breaker is provided with two stationarycontact members A and B and the brid ing contact brush C such as brassor copper. The stationary contact members are spaced apart as shown andI by strips of mica or other insulating mate- 10o rial 19 and by aninsulating tube 19 surrounding the screw 17. The 'members A and B areprovided respectively with extensions 20 and 21 which are received in 0enings or recesses 22 and 23 at one side of the 105 supporting block 13.The main leads and 25 extend through openingsin the oppositeside of theblock which communicate with the large openings in which the contactextensions are seated, and the ends of the 110 which are made of goodconducting material nally as shown at 21.

leads are received in openings in the contact extensions being heldthereto by screws 26 and 27 as will be explained morefull I In Figs. 7and 81 have shown the stationary contact member 13. The extension 21,which is similar'to the extension on member A is slotted or sawedtransversely as shown at 21 leaving a narrow neck por: tion 21', and isslotted or sawed longitudi- The slot 21 extends from the outer face oftheextension to the transverse slot 21*, forming two flexible jawportions 21 d and 21.- The outer faces of the extensions are recessed,as shown, to receive the ends of the leads 24 ahd 25. The free ends ofthe jaws are provided with openings 21 one of which is tapped orscrew-threaded, to receive the tightening screws 26 and 27. Thus it willbe seen that by ,means of the screws 26 and 27, the jaws of theextensions can be tightly clamped about the ends of I and rivets.

the leads.

Connected to the member A is a co per strap 28 shown clearly in Figs. 2and 4 w ich strap is connected to one terminal of the' coils of thecombined tripping magnet and blow out ma net which will be describedlater. The ot er terminal of thecoils of the magnet is connected tostrap 29, which strap is connected-to block A preferably by solder Themember A is recessed .to receive the strap 29 as shown in Fig. 2.

Pivoted to the end of the contact block B by meansof the pintle 30 isthe hand lever 31. This lever consists of two L shape'd copper or brasspunchings 32 which are spaced apart at one end bya block 33 of extrudedmetal section to which the punchings are held by rivets 34. The handle35 which extends through a suitable o ening in the cover (describedlater) is attac ed to the end'of' the block 33 in any desired manner.ings 32 are spaced apart by the loc 36 of extruded metal section towhich the punchings are held by rivets 37. The block 36 carries thebridging contact or brush C and the arcing tip which will now bedescribed. The bridging contact consists of a bundle of lamina 38.connected together andto the holder 39 by bolt 40. The holder 39consists of a punched plate 41 having u wardly eX- tending cars 41 whichstraddle t e block 36. The ears are each provided'with an elongatedopening 42 into. which extends a pin or pro-- jection 43 passing throughand beyond each side of the ,block 36. Thus by means of the slots in theears 41 and the pins or projection on the block 36 the bridging contactor brush is held to the block 36 in such a manfier that there can be aslight relative movement between the block and the bridging contact. tothe brush is provided with a recess in The other ends of the L-sha edunch-' The side of the block 36 adjacentwhich is seatedthespring 43*,which bears on 'the bridging contact and presses the latter away fromthe. block 36 as shown in Fig. 1 whenthe circuit breaker is 0 an or thecontacts are out.of engagement.

contact C is ressed against the stationary contact-mem ersA and B there"will be a slight relative movement between the block 36 and thebridging contact and the spring will be slightly compressed as shown inFig. 2. The advantages of this construction are that it will beunnecessary to accurately position thelocking or engaging parts of thecontact carr ing lever and holding trigger or latch, and t e pressure ofthe bridging con- .tact on both stationary contact members will be thesame.

To the outer free end of the block 36 is pivoted the arm 44 made ofmetalpunching c rrying at its free end the arcing 111 545 ich is adaptedto engage the arcing tip 46 bolted or screwed to the block A. The arcingtips 45 and 46 are preferably made of rolled or extruded sections. Aspring 47 seated in a recess in the arm 36 engages the end of the arm 44and normally presses the arcing tip 45 toward the arcing tip 46: 1 Inorder that there may be a good electric contact between the arm 44 andthe-stationary block or contact member I), the arm and block arejoinedby the flexible shunt 48.

A spiral spring 49 mounted on a sleeve 50 hen the 'circuit breaker isclosed and the bridging carried by the :pintle 30 opens the circuitbreaker with a quick movement when the lever is released by the trippingmagnet. One end of the spring 49 is secured in a hole 51 in the contactmember B and the other end rests against a lug or projection 52 on thelever. The backward movement of the lever under the pressure of thespring 49 is limited by a stop consisting in this case of a bolt 53secured to the-base and a rubber sleeve 54 which acts, as a buffer tolessen the 'shock when the circuit breaker is opened. As here shown thelever is provided with a lug or projection 55" which engages the,

sleeve 54.

The combined tripping and blow-out magnet which has been previouslyreferred to is provided with a pair of coils 56 of concentrically woundstrap conductor, a cylindrical core 58 and'a movable pole shoe 60. Thecoils and core rest against a lug 57 on the base which as will beexplained serves as part of the magnetic circuit of the magnet, and thecoils, core and pole shoe, are held to the base by a screw 59 whichpasses through thecore into the lug 57 and by a washer or disk 59 on theouter end of the screw. The pole shoe is composed principally of threeparts, a plate-61 of non-magnetic material such as copper 'or brass, aplate or arm 62, and a movable armature 63 the parts 62 and 63 being ofmagnetic material such as cast iron. The arm or plate 6.2, the outer end.of which is over the arcing tips, is secured to the plate 61 by rivets64, and the armature 63 is pivoted to the arm or plate 62, at 65. Theend of the core 58 is recessed or cut away forming a shoulder 58 betweenwhich and the disk 59 the plate 61 is held. This construction permitsthe pole shoe to be turned about the pole as a pivot when it is desiredto inspect or remove the contacts. Tlle'armature 63 extends over themagnet and is nor-- n'ially held away from the core by a spring 66 whichis connected at one end -to an L- shaped sheet metal plate 67 riveted tothe pole shoe as shown at 68, and at the other end is attached to a nut69 adjustably mounted on a screw 70. This screw 70 has a threaded shankor body, a knurled head, and Ushaped member 72 having V-shaped legswhich engage or bear on two notched lugs 73 integral with the pivotedarmature 63. The armature is adapted to be normally llt'ltl in positionshown in Fig. 1 by means of a spring 66 and will be attracted to the magnet core when a predetermined current passes through the magnet coils.By adjusting the tension of the spring 66, the armatures can be causedto be attracted at any desired value of current in the magnet coils. Theplate 67 is prcferal'ily provided with graduations for calibrating thespring 66.

As shown in Figs. 1 and 2 the armature 63 has a laterally extending arm74 which is adapted to engage the releasing trigger 75 of the circuitbreaker when the latter is attracted to the core of the magnet. and inits lower side a wooden knob 76 which is adapted to extend through thecover of the circuitbreal er. Means is thus provided for manuallyopening the circuitl reaker.

The releasing trigger 7.) is pivoted intermediate its ends on a pin 77mounted in cars 78 integral with the base 10. One end 79 of the triggerextends towardthe. magnet and is adapted to be engaged by the arm 74 onthe armature 63. and the opposite end is connected to a lug on the base10 by a s )ring 80. (inc arm of the trigger is surrounded by insulatingsleeve or tuLe 81 on which is mounted a. hardened steel collar or ring82 provided with a straight perpendicular face 83, and an inclined orcone-sha )ed surface 84. The collar or ring 82 is held in position bytwo insulating sleeves or tubes 86. Mounted on the face of the handlever is a hardened steel lug 87 which is adapted to engage theperpendicular face 8?, of the ring 82 when the circuit breaker closed.'hen the armature is attracted to the core, or when the armature ismoved by hand, the arm 74 engages the end- Tt) of the trigger, rocks thelatter on the pin 77 and swings the holding collar or ring 82 out ofengagement with the lug 87 on the lever, thus allowing the spring 49 toquickly open the circuit-breaker by swinging the lever to the positionshown in Fig. 1.

Directly opposite the arcing tips on the innor side ofthe base 10 is alug 88 which serves as a pole face of the magnet, and on the outer sideof the base extending between the lug SS and lug 57 is an elongated lug89 which serves as a second pole shoeof the magnet. The magnetic circuitof the magnet includesthe followin parts, core 58, armature 63 and arm62 of po e shoe 66, lug 88, .pole shoe 89 and lug 57. It is seen thatthe arcing tips are in the gap between the ends of the pole shoes andtherefore in a strong magnetic field. Consequently any are formed at thetips will be quickly extinguished. The arcing tips are inclosed in ablow out orarcing chute 90 which is made of non-combustible. insulating-materialand is preferably rectangular in shape as shown. The chute isopen at both ends, the outer end extending'through the cover of thecircuit-breaker and being flared or enlarged. One side of the chute isslotted or cut away as shown most clearly in F ig. 2 so that it can heslid into position over the arcing tips. v

The plate 61 is held to the core by the screw 59 and is so mounted thatit can be turned about the screw as a pivot as was explained. As shownin Fig. 2 the plate 61 has a perforated car 91 and the arcing chute hasa perforated lug 92 which registers with the perforated ear )1 when thechute and pole piece are in position. The pivotally mount.- ed pole shoeand the blow out or arcing chute 90 are locked in position by a screw 93of non-magnetic material, which screw engages the car 91, lug 92 and lug94 on the base. if it is desired to move the chute 90 and to' inspect orremove the contact members, the screw 93 a is first removed whereuponthe chute can be withdrawn and the pole shoe can he swung to one sideabout the core 58. In Fig. 5 lhave shown the chute removed and the poleshoe swung to one side or out of its normal position, thus exposing thearcing tips and other parts.

The base 10 is provided near its perinu-ler with a ridge 95 and narrowflange 96 upon which a cover is adapted to rest. The er 97 hassubstantially the same outline as the base 10 and is preferably madefrom hardened sheet metal. This I'H er is held to the base by a singlenut 66 whirh engages the outer threaded end of thrstcp bolt .32)previously described.

The metal parts of the cir uit!arcakcr except the base, bridge. pole pie-c, trig er and standard commercial details such as screws, rivets, etc,are prefer-aid made from rolled, extruded, or drawn nu-t'al sections.All the parts can thus be easily and cheaply made.

I aim in my claims to cover all modifications which do not involve adeparture from the spirit and scope of my invention.

What I claim as new and desire to secure metal, which holds theinsulating block to the base, and contact members mounted on said block.

2. In a circuit breaker, a supporting base having at opposite sides twooutwardly ex tending arms or projections, the adjacent faces of the armsand the base between the arms being provided with a groove or channel, ablock of insulating material seated on said base between the arms, saidblock hav ing recesses or openings communicating with thechannel, saidchannel and recesses being 'lilled with an easily fusible metal whichholds the block in place, and contact members carricd by said block.

3. in a circuit breaker, a supporting base having on opposite sides armsor side portions extending outwardly at right angles therel'rom, saidarms and the base intermediate the same having a groove or channel, ablock of insulating material seated on said base between the arms, saidblock having recesses or openings communicating with the groove in thearms and in the base, said groove and recesses being filled with aneasily fusible metal which holds the block in place, and contact memberscarried by said block. 1

i. In a circuit breaker, a supporting base, a pair of stationary contactmembers secured thereto, said contact members having flat contact faces,and one of said members having a perforated extension, an L-shaped leverpivoted to said eXtensioll, a bridging contact member pivoted to saidlever and arranged to bear upon said flat contact faces, and a coilspring encircling the pivotal support of said lever and having onecndengaging the contact member to which the lever is pivoted and theotherend en aging the lever.

5. In a circuit brealier, a pair of stationary contacts having flatfaces, and a pivoted lever having mounted thereon a bridging contact orbrush arranged to engage the flat faces of said stationary contacts,said bridging contact and lever having a pin and slot connection in linewiththe center of said bridging contact.

8. In a circuit breaker, a pair of stationary contacts having flat facesand a lever carrying a bridging contact or brush, said bridging contactand lever having a pin and slot conand lever, whereby the bridgingcontact is ivotally and yieldingly connected to the ever.

8. In a circuit-breaker, a pair of stationary contacts, a movablebridging contact consisting of a bundle of lamime and a holder having apair of slotted cars, a pivoted lever having projections engaging theslots in the ears, and a spring between the lever and laminze holder.

9. In a circuit-breaker, a block of insulating material, a pair ofstationary contacts mounted on one side thereof, a lever carrying abridging contact, terminals entering the insulating block from the otherside and connected with the stationary contacts, one of the stationarycontacts consisting of two insulated superimposed portions, and atripping magnet having terminals connected respectively to the twoportions.

10. in a circuit-breaker, a stationary contact, a movable contact,arcing tips carried thereby, and a combined tripping and blowout magnethaving a pole shoe extending over ,said arcing tips, said pole shoebeing pivoted to the magnet core.

11. In a circuitbreal er, a stationary contact, a movable contact,arcing tips carried by said contacts, a combined tripping and blow-outmagnet having a pole shoe extending over said arcing tips, said shoebeing pivoted whereby it may be swung to either sideof its normalposition to expose the arcing tips, and a single screw for locking thepole shoe in its normal position. x

12'; in a circuit-breaker, contacts having arcing tips, a combined triping and blowout magnet having a pivotally mounted pole shoe extendingover the arcing tips, and a blow-out chute inclosing the arcing tips,said shoe and chute being locked in position by a single holding means.v

13. In a circuit-breaker, contacts having arcing tips, a combinedtriiping and blowout magnet having a pivotally mounted pole shoe, aremovable blow-out or arcing chute inclosing the arcing tips, and asingle screw "for holding the shoe and blow-out chute i1 position.

14. in a circuit-breaker, a combined tripa combined trip- 16. In acircuitbreaker, a supporting base,

stationary and movable contacts, a lever on which the movable contact ismounted, means for automatically moving the lever to open the circuit, abolt or projection on said base to limit the movement of said lever, and

a cover for said circuit breaker, said bolt or projection extendingthrough the cover and provided with a nut for locking the cover inposition.

17.. In a circuit breaker, a base, an insulatin support .mountedthereon, contact mem ers secured to said support, each con- I tactmember having a cut or slotted extension seated inan opening in saidsupport, each extension having a socket adapted to receive a terminallead or conductor and screws extending. into said sup ort and into theslotted extensions so as to raw the parts of the same together.

18. In a circuit-breaker, an o erating lever, and a trigger having aninsu ated metal ring, said ring being adapted to engage the metal ring,

lever and hold it in its closed position.

19'. In a circuitbreaker, an operating lever' having a laterallyextending lug or projection, and a trigger having an insulated said ringbeing adapted to'engage the projection on'thelever to hold the lever inits'closed position. v

20. In a circuit-breaker,abase, a magnet core attached thereto, and aplate of nonmagnetic material mounted on the core and carrying anarmature, said plate being adapt ed to swivel in a plane normal to thecore.

2] In a circuit-breaker, a'base, a magnet, a swivel shoe, an arcingchute mounted between the base and the, ole shoe, and a single screwadapted to hoFd the pole shoe and chute in position.

22. In a circuit breaker, a base, ablock of insulating material mountedthereon, said block having openings extendin therethrough, contactssecured to said b ock and having cut or slotted extensions seated insaid openings, said extensions having sockets adapted to receiveterminal leads or conductors, and screws passing into said slottedextensions and serving to draw the parts of the same together.

' 23. In a circuit breaker, a supporting base or frame, a combinedtripping and blow out magnet. comprising-a ooi a core and a pole shoe,and a bolt or screw passing through the shoe into the core, said shoebeing movable freely about said core.

24. In a circuit-breaker, a base, a magnet comprising a coil, a core,and a pole shoe, and means for. clamping said core and ole shoe to'saidbase comprising a screw or olt passing through the core into the base,the pole. shoe being mounted for pivotal movement about the end of thecore.

25. In a'circuit breaker, a magnet comprising a coil, a core and a poleshoe, said pole shoe including a sheet or plate ofnon-magnetic materialsecured to said core, amember of magnetic material secured to saidplate, and an armature of magnetic material pivoted to said member.

In testimony whereof I affix my signature, in the presence of twowitnesses.

HERBERT W. CHENEY. Witnesses:

ARTHUR F. KwIs, FRED J. KrNsEY.

